SAN FRANCISCO -- The Phillies will hope for the best, but must prepare for the worst with Roy Halladay.

He will visit Dr. Neal ElAttrache on Tuesday in Los Angeles, where he expects to learn more about his injured right shoulder. ElAttrache works in the office of noted orthopedist Lewis Yocum and is a physican for the Dodgers. The Phillies placed Halladay on the 15-day disabled list Monday with what they called inflammation, but nobody knows exactly what it is.

"I couldn't speculate," said Phillies general manager Ruben Amaro Jr., asked if thought he will see Halladay pitch again this season. "I wish I knew. Hopefully it's something minor and not something major."

In the meantime, the Phillies must find a replacement for Halladay in the rotation. Amaro said the Phillies are looking externally and internally for the long term, but indicated they will promote somebody from Triple-A Lehigh Valley for Friday's start against the D-backs in Phoenix. The top candidates are left-hander Adam Morgan and right-hander Tyler Cloyd.

Amaro said Double-A Reading left-hander Jesse Biddle, who is the organization's top prospect, is not a candidate.

Phillies left-hander John Lannan is on the disabled list with an injured left knee. Amaro said Lannan's timetable to return has not changed, meaning late May at the very earliest.

"He's still a ways away," Amaro said. "He's not a guy that can replace Doc right now, so we'll have to look for other alternatives as we spoke about."

Amaro said he got summoned from the GM's box at Citizens Bank Park to the trainer's room during Sunday's debacle, when Halladay allowed nine runs in 2 1/3 innings against the Marlins. Halladay said he first experienced soreness in his shoulder following his April 24 start against the Pirates, but said nothing until Sunday because he thought it was minor and he could pitch through it.

"He hadn't been able to get over it," Amaro said. "He didn't think that much of it. It was different than anything he had experienced."

Phillies manager Charlie Manuel was asked about Halladay not being upfront about the soreness in his shoulder. He defended Halladay.

"I've been around the game a long time," he said. "I never liked to tell anyone I couldn't play. If you asked me if I could play, I would have never told you I couldn't. You know? I don't want to get into that. I played with a broken arm, I played with a whole lot of things. I got hit in the face and my lip was over my eye and I missed one day. I would never tell you I couldn't play. So, yeah, I could understand that. He felt he could go out there and still pitch. He wasn't thinking about not pitching bad or something like that; he wanted to try.

"Roy is an upstanding guy, a straight guy. Hey, there should be more guys like that. You say, 'Well he's hurt, he's hurt.' But evidently he didn't feel that way, he felt like he could play. Nowadays guys, they get out of the game real easy. That means he has some integrity, that the game means something to him, that he wanted to see if he could help us. It wasn't like he was trying to hurt us. Knowing him like I do, he thought he could pitch."

It turns out he couldn't, and now the Phillies will wait for the news, good or bad.